-LRB- CNN -RRB- -- Scores of emergency personnel on Thursday helped battle a fire that burned a docked Russian nuclear submarine , state media reported .

Wooden scaffolding caught fire Thursday afternoon at a repair dock in Roslyakovo , which is in the Murmansk region in northwest Russia along the Barents Sea , the official Itar-Tass and RIA-Novosti news agencies reported . The flames spread to hull of the nuclear submarine Yekaterinburg , where work had been underway .

About 100 emergency personnel responded , using 40 pieces of firefighting and other equipment to spray foam and water to douse the blaze , the regional emergency ministry said according to Itar-Tass .

Gov. Dmitry Dmitrienko said that the submarine 's nuclear reactors were then shut down and there was no threat of radiation spreading , the news agency reported .

Capt. Vadim Sega , a spokesman for Russia 's northern fleet , added that the fire never penetrated the hull and got inside the ship .

`` There is no possibility of fire burning through the hull , and no threat to on-board equipment , '' Sega said Thursday , according to RIA-Novosti .

The emergency ministry said Thursday that there had been no injuries , reported this news agency . The nuclear sub , itself , was partially submerged to minimize damage .

The fire continued into Friday despite initial reports it had been extinguished , Itar-Tass reported . By 1:40 a.m. , -LRB- 4:40 p.m. ET Thursday -RRB- , the blaze had been `` localized , '' Russian Emergency Minister Sergei Shoigu said .

One of seven Delta-IV class submarines in operation , the Yekaterinburg carries 16 ballistic missiles . According to the military research website RusNavy.com , the vessel was launched in September 1984 , has two nuclear reactors and can carry a 140-person crew .

@highlight

Scaffolding caught fire on a dock in northwest Russia , state media reports

@highlight

The flames spread to the hull of a docked nuclear submarine

@highlight

The fire was `` localized '' early Friday , an official tells a state news agency

@highlight

A local governor says the sub 's reactors were shut down and radiation did n't spread